US2151936A - Character transmitting system - Google Patents

Character transmitting system Download PDF

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Publication number
US2151936A
US2151936A US108576A US10857636A US2151936A US 2151936 A US2151936 A US 2151936A US 108576 A US108576 A US 108576A US 10857636 A US10857636 A US 10857636A US 2151936 A US2151936 A US 2151936A
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US
United States
Prior art keywords
spring
edge
picture
shaft
synchronizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US108576A
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English (en)
Inventor
Pflugner Helmut
Sohn Ernst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2151936A publication Critical patent/US2151936A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L21/00—Apparatus or local circuits for mosaic printer telegraph systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L21/00—Apparatus or local circuits for mosaic printer telegraph systems
    • H04L21/04—Apparatus or local circuits for mosaic printer telegraph systems at the receiving end

Definitions

  • each signal that is sent is at the receiving station several times written down on the recording tape.
  • the invention therefore has for its object to record the characters only once and to employ a synchronizing method which shall be as simple as possible and by which on the one hand the time required for transmission will not or will only slightly be increased, while on the other hand the expenditure in apparatus on the receiving side shall be as small as possible.
  • the synchronizing impulses are given in the pauses between the picture lines which serve to compose the characters, and they are also caused to clutch the writing device to the continuously running motes, the writing device remaining in this condition during one revolutlon.
  • Fig. i is a diagram illustrating the method employed in connection with the novel arrangegg merit.
  • Fig. 2 is a partially diagrammatic per- The invention is'described hereafter by way fol example, reference being had to the accom-' spective view showing one embodiment of this arrangement.
  • Fig. 3 is an elevation showing a modification of the arrangement representedin Fig. 2.
  • Fig. 4 is an end view to Fig. 3. I
  • a receiving tape l and some charac ters A, B, C, D thereon are represented.
  • a short synchronizing impulse 3 given at the commencement of the picture line, is marked as a dot.
  • the characters are reproduced with the aid of seven picture lines each. In the pauses between the characters no synchronizae tion isfleifected because it is not necessary to synchronize here.
  • the writing device represented in Figs. 2, 3, 4 has a so-called Meyer edge C and a counter edge S adapted to cooperate therewith in order to record the impulses in a well known manner.
  • a cylinder or barrel B On a cylinder or barrel B the edge C is arranged as a helical crest. Barrel B is mounted loosely on the shaft A of the motor M. Coiled around shaft A is a helical spring F one end of which is fixed to barrel B in the manner, for instance, appearing from Figs. 3 and 4. This spring tends to contract in order to come in fric- Ill tional contact with shalt A and has a free end.
  • Lever K is the armature of an electromagnet Q and is under the action of a retractile spring E.
  • stop n forms part of a lever H fulcrumed at d.
  • This lever is the armature of an electromagnet R and is attached to a retractile spring D.
  • stop 12 forms part of a leaf spring I mounted at g.
  • Spring carries a tappet a that projects into the path of the edge S but does not extend beyond edge C, being spaced at about 0.1 millimetre, or nearly so, from the circumference thereof.
  • Edge 0 has a recess b.
  • the mode of action is as follows:
  • each synchronizing impulse given at the commencement of a picture line, energizes magnet R which then attracts lever H.
  • the free end of the spring F is released.
  • This spring in its eifort to contract comes in frictional contact with the rotating shaft A and thus acts to clutch the barrel B to this shaft.
  • the device B, C is hence caused to share in the rotation of shaft A until the free end of the spring F comes against tooth n, lever H having been restored to. normal by spring D after the cessation of the synchronizing impulse.
  • this spring By the free end of spring F striking the tooth n, this spring is expanded so as to release shaft A.
  • the device B, C therefore ceases to rotate, having performed one revolution in this way.
  • Magnet Q. Fig. 2 is energized by the picture impulses. and by means of lever K and spring E causes the edge 5 to be pressed against edge C in the rhythm of these impulses.
  • FIG. 2 As the arrangement shown in Fig. 2 has two magnets. namely, magnet R for the synchronizing impulses and magnet Q for the picture impulses, there must be a switching device for changing from one magnet to the other.
  • An arrangement of cam discs or any other suitable device may serve this purpose.
  • the synchronizing impulse given at-the beginning of each picture line. is not delivered separately from the picture impulse but is given in conjunction therewith, without however being. recorded.
  • the fact that the synchronizing impulse is not recorded is due to recess b, as described before. Paper tape P is during the recording moved continuously, this being contrary to the start stop writers.
  • the advantage of the n vel arrangement resides in the fact that the device can be made to occupy a comparatively small space while being simple in mechanical and electrical relation.
  • a recording for recording characters composed of a plurality of electric impulses which when recorded form the separate characters comprising a transcribing means including a shaft, 9. cylinder provided with a helical edge rotatably mounted on said shaft, a motor for continuously rotating said shaft, a spring clutch including a helical spring wound around said shaft and having a free projecting end for coupling said cylinder to said shaft, means including a detent engaging the free end of said spring and tending to force it in a direction opposite to the winding of the spring for holding said clutch out of engagement with said shaft inthe absence of signals, and means responsive to receipt of a synchronizing impulse to eifect engagement of said clutch with said shaft.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Operated Clutches (AREA)
  • Facsimiles In General (AREA)
US108576A 1935-10-31 1936-10-31 Character transmitting system Expired - Lifetime US2151936A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE468915X 1935-10-31

Publications (1)

Publication Number Publication Date
US2151936A true US2151936A (en) 1939-03-28

Family

ID=6540937

Family Applications (1)

Application Number Title Priority Date Filing Date
US108576A Expired - Lifetime US2151936A (en) 1935-10-31 1936-10-31 Character transmitting system

Country Status (4)

Country Link
US (1) US2151936A (pl)
BE (1) BE418127A (pl)
FR (1) FR812576A (pl)
GB (1) GB468915A (pl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516217A (en) * 1944-12-09 1950-07-25 Keinath George Strip chart recorder
US2646518A (en) * 1948-02-28 1953-07-21 Eastman Kodak Co Facsimile recording apparatus
US2717191A (en) * 1952-05-20 1955-09-06 Faximile Inc Sinusoidal recorder
US3095569A (en) * 1958-07-24 1963-06-25 Conval Corp Recorder
US3293653A (en) * 1963-12-21 1966-12-20 Fujitsu Ltd Tape recording device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516217A (en) * 1944-12-09 1950-07-25 Keinath George Strip chart recorder
US2646518A (en) * 1948-02-28 1953-07-21 Eastman Kodak Co Facsimile recording apparatus
US2717191A (en) * 1952-05-20 1955-09-06 Faximile Inc Sinusoidal recorder
US3095569A (en) * 1958-07-24 1963-06-25 Conval Corp Recorder
US3293653A (en) * 1963-12-21 1966-12-20 Fujitsu Ltd Tape recording device

Also Published As

Publication number Publication date
GB468915A (en) 1937-07-15
BE418127A (pl)
FR812576A (fr) 1937-05-12

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